Method: static {...}

1: /**
2: * Copyright (C) 2016 Czech Technical University in Prague
3: *
4: * This program is free software: you can redistribute it and/or modify it under
5: * the terms of the GNU General Public License as published by the Free Software
6: * Foundation, either version 3 of the License, or (at your option) any
7: * later version.
8: *
9: * This program is distributed in the hope that it will be useful, but WITHOUT
10: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11: * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
12: * details. You should have received a copy of the GNU General Public License
13: * along with this program. If not, see <http://www.gnu.org/licenses/>.
14: */
15: package cz.cvut.kbss.ontodriver.owlapi.connector;
16:
17: import cz.cvut.kbss.ontodriver.Closeable;
18: import cz.cvut.kbss.ontodriver.config.Configuration;
19: import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
20: import cz.cvut.kbss.ontodriver.owlapi.exception.OwlapiDriverException;
21:
22: /**
23: * Common superclass for the storage connectors.
24: * <p>
25: * Declares the basic interface and stores storage info.
26: */
27: abstract class AbstractConnector implements Closeable, Connector {
28:
29: final Configuration configuration;
30:
31: private volatile boolean open;
32:
33: AbstractConnector(Configuration configuration) throws OwlapiDriverException {
34: assert configuration != null;
35:
36: this.configuration = configuration;
37: initializeConnector();
38: this.open = true;
39: }
40:
41: @Override
42: public boolean isOpen() {
43: return open;
44: }
45:
46: @Override
47: public void close() throws OntoDriverException {
48: this.open = false;
49: }
50:
51: protected void ensureOpen() {
52: if (!open) {
53: throw new IllegalStateException("The connector is closed.");
54: }
55: }
56:
57: /**
58: * Initializes the connector.
59: */
60: protected abstract void initializeConnector() throws OwlapiDriverException;
61: }